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  • oilseed rape  (3)
  • Brassica napus  (2)
  • (Z)-11-hexadecenyl acetate  (1)
  • 1
    Digitale Medien
    Digitale Medien
    The responses of the cabbage seed weevil (Ceutorhynchus assimilis) to the odour of oilseed rape (Brassica napus) and to some volatile isothiocyanates (1993)
    Springer
    Entomologia experimentalis et applicata 68 (1993), S. 295-302 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Ceutorhynchus assimilis ; oilseed rape ; host plant volatiles ; attractant ; olfactometer ; isothiocyanate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The responses of the cabbage seed weevil,Ceutorhynchus assimilis Payk. (Coleoptera: Curculionidae) to volatiles from oilseed rape (Brassica napus L.) were tested using a linear track olfactometer. Weevils were attracted towards the odour of rape during a short period before diapause and for most of their postdiapause life. Odours from both the flowering and green parts of the plant were attractive, but the odour of a non-host plant (Bellis perennis L.) was not. An entrainment extract of flowering rape volatiles in pentane was attractive, but significantly less so than the odour of flowering rape itself. Attraction was found to 3-butenyl and 4-pentenyl isothiocyanate (NCS), but not to 2-phenylethyl isothiocyanate. A mixture of the three NCSs was more attractive than the individual NCSs. However, the concentration required to produce a response was still relatively high. Isothiocyanates, along with other volatiles from rape, probably play a role in host plant recognition by the seed weevil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02380783
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The influence of glucosinolates and sugars on feeding by the cabbage stem flea beetle,Psylliodes chrysocephala (1994)
    Springer
    Entomologia experimentalis et applicata 73 (1994), S. 77-83 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Psylliodes chrysocephala ; cabbage stem flea beetle ; oilseed rape ; host plant selection ; glucosinolates ; surgars ; feeding stimulant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Agar was used as an artificial substrate to investigate the feeding behaviour of the cabbage stem flea beetle,Psylliodes chrysocephala L. (Coleoptera: Chrysomelidae), an important pest of winter oilseed rape (Brassica napus) in Europe. Both glucosinolates and sugars stimulated feeding when added to agar. The amount of feeding that occurred was affected by the type and concentration of glucosinolate and surgar and also by combinations of components. Although glucosinolates were potent feeding stimulants forP. chrysocephala, they were not a prerequisite for feeding, nor does it seem likely that glucosinolate profiles are used by this species to discriminate amongst cruciferous plants at the gustatory level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02382516
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    The responses of the cabbage seed weevil Ceutorhynchus assimilis to volatile compounds from oilseed rape in a linear track olfactometer (1997)
    Springer
    Entomologia experimentalis et applicata 85 (1997), S. 257-262 
    Details
    ISSN: 1570-7458
    Schlagwort(e): cabbage seed weevil ; Ceutorhynchus assimilis ; oilseed rape ; Brassica napus ; host-plant volatile ; olfactometer ; (Z)-3-hexen-1-ol ; methyl salicylate ; nitriles ; cyanides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The cabbage seed weevil, Ceutorhynchus assimilis Payk. [syn. Ceutorhynchus obstrictus (Marsham)] (Coleoptera: Curculionidae), a crucifer-feeding insect, is a pest of oilseed rape (Brassica napus L.). It is known to be attracted by isothiocyanates, crucifer-specific volatiles that are metabolites of the glucosinolates. The responses of this insect to other electrophysiologically-active volatiles from rape were tested in a linear track olfactometer. Attraction was demonstrated to nitriles (phenylacetonitrile, 4-pentenenitrile and 5-hexenenitrile), which are also glucosinolate metabolites, and to volatiles emitted by a wider spectrum of plant families ((Z)-3-hexen-1-ol and methyl salicylate). Combination of an isothiocyanate mixture with phenylacetonitrile increased attraction, but there was no such increase when the isothiocyanate mixture was combined with methyl salicylate. A mixture of 23 volatiles, emulating an attractive air-entrainment extract of oilseed rape, was not significantly attractive, although a high proportion of weevils (60%) turned towards it. The potential of these volatiles for inclusion into an isothiocyanate-based monitoring system is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003140219888
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Optimization of Pheromone Dispensers for Diamondback Moth Plutella xylostella (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2145-2159 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Lepidoptera ; Plutellidae ; (Z)-11-hexadecenyl acetate ; (Z)-11-hexadecenal ; Plutella xylostella L. ; diamondback moth ; sex pheromone ; dispenser ; cabbage ; pheromone evaporation rate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract We have investigated the effects of pheromone dispenser design, pheromone release rate, and the products of Z11–16:Ald decomposition on the attractiveness of the pheromone blend (Z)-11-hexadecenyl acetate, (Z)-11-hexadecenal, and (Z)-11-hexadecen-1-ol) in traps to Plutella xylostella males. Rubber minidispensers (K-50) were shown to have an active exposure time of at least two months and in delta traps to be capable of monitoring a population of P. xylostella throughout the summer in Estonia. Pheromone release rates between 8 and 17 ng/hr are recommended for maximum trap catches. The attractive blend contained 15–35% of Z11–16:Ac. Decomposition products of Z11–16:Ald inhibited the activity of the pheromone blend when more than 50% of the aldehyde had decomposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006435.13481.ba
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Perception of Oviposition-Deterring Pheromone by Cabbage Seed Weevil (Ceutorhynchus assimilis) (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 1655-1670 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Oviposition-deterring pheromone ; host marking pheromone ; marker ; electrophysiology ; contact chemoreception ; gustatory sensilla ; antenna ; behavior ; Ceutorhynchus assimilis ; Coleoptera ; Curculionidae ; Brassica napus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Following oviposition into a pod of oilseed rape (Brassica napus), the female cabbage seed weevil (Ceutorhynchus assimilis) marks the pod with oviposition-deterring pheromone (ODP) by brushing it with her eighth abdominal tergite. On an unmarked pod, oviposition site selection was always accompanied by intensive antennation of the pod. Females approaching a freshly ODP-marked pod brought their antennae within 1 mm of the pod but usually did not antennate it before rejecting it for oviposition. Females with the clubs of their antennae amputated continued to discriminate pods from stems or petioles as oviposition sites but showed no behavioral response to ODP. Extracts of volatiles air-entrained from ovipositing weevils failed to inhibit oviposition. Air passed over a behaviorally active extract of ODP did not elicit a detectable electroantennogram response. By contrast, when presented as a gustatory stimulus to the sensilla chaetica of the antennal club, a behaviorally active extract of ODP from postdiapause, gravid females elicited a strong electrophysiological response. This response usually involved more than one cell and displayed a phasic–tonic time course over the recording period of 10 sec. Extract from prediapause (and hence sexually immature) females elicited neither behavioral nor electrophysiological (contact) responses. Thus the ODP of the cabbage seed weevil is sensed primarily by contact chemoreception at the sensilla chaetica of the antennae, and the electrophysiological responses recorded from these gustatory sensilla are of value as the basis of a bioassay to assist identification of the active constituent(s) of the pheromone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1020801319251
    Standort Signatur Erwartet Verfügbarkeit
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